From: Adam Beneschan <adam@irvine.com>
Subject: Re: Ada 2012: In-out parameters for functions
Date: Fri, 3 May 2013 18:02:10 -0700 (PDT)
Date: 2013-05-03T18:02:10-07:00 [thread overview]
Message-ID: <885a6f9e-cb8b-4823-9f02-3cab5f172076@googlegroups.com> (raw)
In-Reply-To: <km1h9d$k5k$1@munin.nbi.dk>
On Friday, May 3, 2013 4:29:46 PM UTC-7, Randy Brukardt wrote:
> I agree that named notation should include the direction of the parameter,
> but again its way too late to fix. The best syntax would have been
> Proc (In_Param => A, Out_Param <= B, In_Out_Param <=> C);
> but unfortunately "<=" is used for less-than-or-equals and trying to use it
> in this context would be ambiguous.
>
> So the best practical syntax would be:
> Proc (In_Param -> A, Out_Param <- B, In_Out_Param <-> C);
> But adding new compound delimiters has never been done (lexical elements are
> unchanged since Ada 83, the only changes being to allow Unicode characters
> in identifiers and strings), and this scares people. Moreover, we don't have
> any current delimiters that have three characters. So this would likely have
> a lot of change to tools, at a very fundemental level.
This particular change would break any code that looks like
if X<-1 then ...
and you just gotta know that there's some out there, no matter how ugly it looks.
Ada 80 (?) would have said
Proc (In_Param =: A, Out_Param := B, In_Out_Param :=: C)
Don't know why they didn't stick with it.
-- Adam
next prev parent reply other threads:[~2013-05-04 1:02 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-01 16:28 Ada 2012: In-out parameters for functions dptrash
2013-05-01 17:27 ` Shark8
2013-05-01 19:04 ` Yannick Duchêne (Hibou57)
2013-05-01 19:37 ` Dmitry A. Kazakov
2013-05-01 19:58 ` Yannick Duchêne (Hibou57)
2013-05-02 6:41 ` Dmitry A. Kazakov
2013-05-02 7:11 ` Yannick Duchêne (Hibou57)
2013-05-01 23:37 ` Peter C. Chapin
2013-05-03 10:48 ` anon
2013-05-03 11:04 ` Simon Clubley
2013-05-03 11:32 ` Simon Wright
2013-05-03 11:42 ` Yannick Duchêne (Hibou57)
2013-05-03 11:54 ` Yannick Duchêne (Hibou57)
2013-05-03 23:29 ` Randy Brukardt
2013-05-04 1:02 ` Adam Beneschan [this message]
2013-05-05 5:16 ` Randy Brukardt
2013-05-05 10:24 ` Niklas Holsti
2013-05-05 11:11 ` Yannick Duchêne (Hibou57)
2013-05-05 12:52 ` Bill Findlay
2013-05-05 15:09 ` Niklas Holsti
2013-05-05 19:23 ` Yannick Duchêne (Hibou57)
2013-05-05 20:37 ` Niklas Holsti
2013-05-07 0:30 ` Randy Brukardt
2013-05-07 2:36 ` Yannick Duchêne (Hibou57)
2013-05-05 19:45 ` Yannick Duchêne (Hibou57)
2013-05-06 15:40 ` Adam Beneschan
2013-05-06 16:17 ` Bill Findlay
2013-05-06 16:47 ` Adam Beneschan
2013-05-06 18:43 ` Bill Findlay
2013-05-07 0:07 ` Dennis Lee Bieber
2013-05-07 2:34 ` Yannick Duchêne (Hibou57)
2013-05-07 0:26 ` Randy Brukardt
2013-05-06 15:26 ` Adam Beneschan
2013-05-07 0:36 ` Randy Brukardt
2013-05-07 3:59 ` Yannick Duchêne (Hibou57)
2013-05-07 4:13 ` Yannick Duchêne (Hibou57)
2013-05-07 11:52 ` Yannick Duchêne (Hibou57)
2013-05-03 11:45 ` AdaMagica
2013-05-03 23:54 ` Randy Brukardt
2013-05-04 6:58 ` J-P. Rosen
2013-05-04 7:21 ` Dmitry A. Kazakov
2013-05-04 17:58 ` J-P. Rosen
2013-05-04 7:40 ` Yannick Duchêne (Hibou57)
2013-05-04 8:05 ` Simon Wright
2013-05-04 17:55 ` J-P. Rosen
2013-05-04 0:40 ` Keith Thompson
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